noun, noun or participle which takes 'suru', intransitive verb
pee; wee; number one
Childish or colloquial word for urine or urination. Used by children or in casual, intimate settings. The verb form is おしっこをする.
子供が「おしっこ！」と言った。
The child said, "I need to pee!"
犬が散歩中におしっこをした。
The dog peed during the walk.